Synthesis and characterization of poly(amino acid methacrylate)-stabilized diblock copolymer nanoobjects
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1 Electronic Supplementary Material (ESI) for Polymer Chemistry. This journal is The Royal Society of Chemistry 2014 Supporting Information for Polymer Chemistry manuscript: Synthesis and characterization of poly(amino acid methacrylate)-stabilized diblock copolymer nanoobjects Vincent Ladmiral,* Alexandre Charlot, Mona Semsarilar, Steven P. Armes* Note regarding RAFT agent efficiency Differences between the mean DP calculated by 1 H NMR end-group analysis and the DP calculated using the following equation DP = (n M0 /n RAFT0 ) x conversion, (where n M0 and n RAFT0 are, respectively, the molar quantities of monomer and RAFT agent introduced in the reaction at t = 0) were observed. 1 H NMR end-group analysis of RAFT polymers is based on the assumption that every polymer chain possesses the Z-group of the RAFT agent at its ω-end. Several reactions can occur in the course of the polymerization, or during purification/work-up that might undermine this assumption: (1) premature termination between polymer radicals or via their reaction with other radicals; (2) hydrolysis of the trithiocarbonate group during either synthesis or work-up (e.g. dialysis); (3) lower than expected participation of the RAFT agent in the polymerization.; (4) error in the mass of RAFT agent and/or monomer actually used for the polymerization; (5) impurities in the RAFT agent. In our calculations, chain transfer does not have any impact since this side reaction does not reduce the number of RAFT end-groups. Nonetheless, it is very difficult to identify the cause of the difference between the DP calculated from 1 H NMR end-group analysis and the theoretically expected DP. We have chosen to interpret this discrepancy in terms of RAFT agent (in)efficiency.
2 Figure S1. NMR signal assignment for GSHMA O O OH O 8 9 O NH 17 3 S 19 H 18 N 11 OOC O O N COO H H NMR ( MHz, DMSO-d 6, 298K): δ 1.95 (s, 3H 3 ), 2.15 (dd, 2H 19 ), (dt, 2H 20 ), (m, 2H 9, 2H 10, 2H 11 ), (dd, 1H 12 ), 3.34 (t, 1H, OH), (m, 4H, 1H 6, 2H 15, 1H 21 ), (m, 4H, 2H 5, 2H 7 ), 5.77 (d, 1H 1 ), 6.18 (d, 1H 1 ), 8.19 (t, 1H 14 ), 8.52 (d, 3H 22 ). 13 C NMR ( MHz, DMSO-d 6, 298K): δ 17.5 (C 3 ), 26.3 (C 20 ), 26.7 (C 10 ), 31.5 (C 19 ), 33.0 (C 11 ), 34.2 (C 9 ), 43.5 (C 15 ), 54.2 (C 6 ), 62.1 (C 21 ), 65.3 (2C, C 5, C 7 ), 66.9 (C 12 ), (C 1 ), (C 2 ), 169.3, 171.8, 174.0, 174.8, 176.1, (6C, C 4, C 8, C 13, C 16, C 18, C 23 ).
3 Figure S2. Acid titration of glutathione methacrylate (GSHMA) V eq2 = ml ph 8 6 V eq1 = 7.74 ml V NaOH (ml) V 0 = 1mL of GSHMA solution was diluted to 5 ml with DI water and titrated with an aqueous 75 mm NaOH solution. [GSHMA] 0 = ((V eq2 -V eq1 )* c NaOH )/ V 0 = M.
4 Figure S3. DMF GPC chromatograms obtained for PCysMA 31 and PGSHMA 24 DMF gel permeation chromatograms recorded for: (a) PCysMA 31, 94 % conversion, M n (NMR) = 10,700 g mol -1, M w /M n = 1.11; (b) PGSHMA 24, 98 % conversion, M n (NMR) = 12,800 g mol -1, M w /M n = PCysMA 31 and PGSHMA 24 were derivatized (acetylation using acetic anhydride for PCysMA 31 and both Michael addition with 2-hydroxyethyl acrylate and methylation with trimethylsilyl diazomethane in the case of PGSHMA 24 ) prior to GPC analysis.
5 Figure S4. RAFT solution polymerization of cysteine methacrylate (CysMA) First-order kinetic plot and evolution of conversion vs time for the RAFT polymerization of CysMA in an 83:17 w/w water/dioxane mixture at 70 C. Reaction conditions: [CysMA] : [PETTC] : [ACVA] = 50 : 1 : 0.2, [CysMA] = 9 wt %. Evolution of M n and polydispersity vs conversion for the RAFT polymerization of CysMA in an 83:17 w/w water/dioxane mixture at 70 C. Reaction conditions: [CysMA] : [PETTC] : [ACVA] = 50 : 1 : 0.2, [CysMA] = 9 wt %.
6 c = 24.0 % (50 min) c = 37.2 % (70 min) c = 65.0 % (110 min) c = 75.3 % (140 min) c = 82.2 % (173 min) c = 90.8 % (217 min) c = 95.6 % (260 min) M n (g mol -1 ) Aqueous GPC chromatograms obtained for samples taken at different times during the RAFT solution polymerization of CysMA in water/dioxane mixture.
7 Figure S5. Phase diagram and representative TEM images obtained for the RAFT aqueous dispersion polymerization of HPMA using a PGSHMA 24 macro-cta (a) Phase diagram constructed for PGSHMA 24 PHPMA x diblock copolymer nano-objects prepared by RAFT aqueous dispersion polymerization of HPMA using a PGSHMA 24 macro-cta at 70 C. The target PHPMA DP and the total solids content were systematically varied and the post mortem copolymer morphologies obtained at > 98 % HPMA conversion were determined by TEM. N.B. S denotes spheres. (b) Representative TEM images obtained for PGSHMA 24 PHPMA x (denoted GSH 24 H x for brevity) diblock copolymer nano-objects prepared by RAFT aqueous dispersion polymerization of HPMA at 70 C. The target block composition and copolymer solids content % are indicated on each image.
8 Figure S6. TEM images obtained for diblock copolymer nano-objects formed in the presence of NaCl 200 nm H 152, 20 % 0.25 M NaCl 500 nm H 287, 20 % 0.25 M NaCl 200 nm 500 nm 500 nm H 139, 20 % 0.5 M NaCl H 296, 20 % 0.5 M NaCl H 198, 20 % 0.5 M NaCl Representative TEM images obtained for PGSHMA 24 PHPMA x diblock copolymer nano-objects prepared by RAFT aqueous dispersion polymerization of HPMA at 70 C in the presence of NaCl. The targeted DP for the PHPMA block (herein denoted by H for brevity) and the copolymer solids content % is indicated on each image.
9 Figure S7. TEM images obtained for diblock copolymer nano-objects prepared using relatively short PGSHMA macro-ctas Representative TEM images obtained for PGSHMA 11 PHPMA x and PGSHMA 15 PHPMA x diblock copolymer nano-objects prepared by RAFT aqueous dispersion polymerization of HPMA at 70 C. The targeted DP for the PHPMA block (herein denoted by H for brevity) and the copolymer solids content % is indicated on each image.
10 Figure S8. DMF GPC chromatogram obtained for PGMA 55 macro-cta M n (g mol -1 ) DMF GPC chromatogram obtained for PGMA 55 : M n = 15,100 g mol -1, M w = 19,600 g mol -1, M w / M n = 1.15
11 Figure S9. Temperature dependence of the storage and loss moduli observed for a 20 % w/w PGSHMA 24 + PGMA 55 )-PHPMA 178 diblock copolymer worm gel dispersion G', G'' (Pa) G' 1st cooling G'' 1st cooling G' heating G'' heating G' 2nd cooling G'' 2nd cooling Temperature ( C) Variation of storage modulus (G ) and loss modulus (G ) for a 20% w/w (1:9 PGSHMA 24 + PGMA 55 )-PHPMA 178 diblock copolymer worm gel dispersion during the following temperature cycling: (i) cooling from 25 to 1 C (G = inverted black triangles, G = inverted black and white triangles); (ii) subsequent warming from 1 to 25 C in 1 C increments (G = red triangles, G = red and white triangles) and (iii) cooling from 25 to 1 C in 1 C increments (G = inverted blue triangles, G = inverted blue and white triangles). Notes: The cross-over temperature appeared to be slightly below 1 C in this case. Hysteresis is observed between the first cooling and heating cycles. This was much less marked between the heating and the second cooling cycles.
12 Figure S10. Temperature-dependent DLS studies of diblock copolymer worm dispersions Temperature-dependent DLS studies, showing the variation in intensity-average diameter and scattered light intensity respectively, for: (a, b) a (1:9 PCysMA 31 + PGMA 55 )-PHPMA 166 dispersion of diblock copolymer worms diluted to 1% w/w; (c, d) a (1:9 PGSHMA 24 + PGMA 55 )-PHPMA 178 dispersion of diblock copolymer worms diluted to 1.0% w/w. In the case of (1:9 PCysMA 31 + PGMA 55 )-PHPMA 166 (see Figures S10a and S10b), the apparent sphere-equivalent hydrodynamic diameter decreases from around 90 nm at 25 C to 20 nm at 1 C, with a concomitant reduction in the scattered light intensity. These measurements are consistent with visual observations and rheological data and confirm that degelation occurs via a worm-to-sphere transition. However, on warming the cold 1% w/w copolymer dispersion to ambient temperature, the sphere-to-worm transition is not observed, even on standing for relatively long time scales (weeks). This is because of the reduced probability of efficient 1D fusion of spheres at this relatively low copolymer concentration. 76b The DLS data (see Figures S11c and S11d) are very similar to those obtained for a dilute dispersion of (1:9 PCysMA 31 + PGMA 55 )-PHPMA 166. Thus cooling a 1% w/w dispersion of (1:9 PGSHMA 24 + PGMA 55 )-PHPMA 178 diblock copolymer nano-objects results in a near-monotonic reduction in particle size and scattered light intensity. Polydisperse worms with a sphere-equivalent diameter of 180 nm were observed at 25 C, while near-monodisperse spheres of 40 nm were obtained below 10 C. No sphere-to-worm transition occurred on returning to 25 C, confirming that the (ir)reversibility of this thermal transition has a strong concentration dependence.
13 Figure S11. Variation of zeta potential and intensity-average diameter with ph for spheres, worms and vesicles. Variation of zeta potential and intensity-average diameter with ph for spheres, worms and vesicles. (a) Intensity-average diameter vs. ph for PGMA 55 -PHPMA 100 spheres (black squares), (1:9 PCysMA 31 + PGMA 55 )-PHPMA 110 (red circles), and (1:9 PGSHMA PGMA 55 )-PHPMA 100 (blue triangles). (b) Zeta potential vs. ph for the same diblock copolymer dispersions. (c) Intensityaverage diameter vs ph for PGMA 55 -PHPMA 140 worms (black squares), (1:9 PCysMA 31 + PGMA 55 )-PHPMA 166 (red circles), and (1:9 PGSHMA 24 + PGMA 55 )-PHPMA 178 (blue triangles). (d) Zeta potential vs. ph for the same diblock copolymer dispersions. (e) Intensity diameter vs ph for PGMA 55 -PHPMA 230 vesicles (black squares), (1:9 PCysMA 31 + PGMA 55 )-PHPMA 300 (red circles), and (1:9 PGSHMA 24 + PGMA 55 )-PHPMA 300 (blue triangles). (f) Zeta potential vs. ph for the same diblock copolymer dispersions.
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